CFD Online Discussion Forums - [snappyHexMesh] first cell height and mesh quality

Hello,

I'm trying to mesh a hull geometry but I can't seem to be able to create prism layers with first cell height 0.001m.

If I increase the first cell height (say to 0.007m) I get some layers.

If I turn off all quality controls in the meshQualityDict I get all the layers (and they look ok) but then the checkMesh fails.

I am using absolute sizes (relativeSizes false) and firstAndRelativeFinal for the thickness model.

I've also attached the checkMesh log file in which I notice the following three lines:

Code:

  <<Number of duplicate (not baffle) faces found: 32. This might indicate a problem.

  <<Number of faces with non-consecutive shared points: 32. This might indicate a problem.

  <<Writing 88 faces with non-standard edge connectivity to set edgeFaces

but I really don't know where to start looking in order to rectify anything that is implied as the underlying issue.

What am I missing?

I would appreciate any help.

Thanks!

PS

Code:

addLayersControls

{

    // Are the thickness parameters below relative to the undistorted

    // size of the refined cell outside layer (true) or absolute sizes (false).

    relativeSizes false;

    

    // thicknessModel keyword that can take the value of:

    // firstAndOverall;

    // firstAndExpansion;

    // finalAndOverall;

    // finalAndExpansion;

    // overallAndExpansion; or

    // firstAndRelativeFinal

    thicknessModel firstAndRelativeFinal;



    firstLayerThickness 0.001;



    // Wanted thickness of final added cell layer. If multiple layers

    // is the thickness of the layer furthest away from the wall.

    // Relative to undistorted size of cell outside layer.

    // See relativeSizes parameter.

    finalLayerThickness 0.5; //$fLayerThickness;



    // Expansion factor for layer mesh

    //~ expansionRatio 1.2;



    //  Overall thickness of the cells (size specification depends on the 

    //  relativeSizes parameter). 

    //  Ignored if using finalLayerThickness or firstLayerThickness.

    //~ thickness 1.5;



    // Minimum thickness of cell layer. If for any reason layer

    // cannot be above minThickness do not add layer.

    // See relativeSizes parameter.

    minThickness 1e-4;





    // Per final patch (so not geometry!) the layer information

    layers

    {

        bowPort

        {

            nSurfaceLayers 15;   

            //~ thicknessModel firstAndRelativeFinal;

            //~ firstLayerThickness 0.001;

            //~ finalLayerThickness 0.5;

            //~ thickness 0.2;

            //~ expansionRatio 1.2;

            //~ minThickness 0.0;

        }

...

...

...

OF version is 2012